溫馨提示×
您好，登錄后才能下訂單哦！
點擊 登錄注冊 即表示同意《億速云用戶服務(wù)條款》
您好，登錄后才能下訂單哦！
本篇文章給大家分享的是有關(guān)什么是redis集群配置與管理，小編覺得挺實用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
Redis在3.0版本以后開始支持集群，經(jīng)過中間幾個版本的不斷更新優(yōu)化，最新的版本集群功能已經(jīng)非常完善。本文簡單介紹一下Redis集群搭建的過程和配置方法，redis版本是5.0.4，操作系統(tǒng)是中標麒麟（和Centos內(nèi)核基本一致）。
1、Redis集群原理
Redis 集群是一個提供在多個Redis間節(jié)點間共享數(shù)據(jù)的程序集，集群節(jié)點共同構(gòu)建了一個去中心化的網(wǎng)絡(luò)，集群中的每個節(jié)點擁有平等的身份，節(jié)點各自保存各自的數(shù)據(jù)和集群狀態(tài)。節(jié)點之間采用Gossip協(xié)議進行通信，保證了節(jié)點狀態(tài)的信息同步。
Redis 集群數(shù)據(jù)通過分區(qū)來進行管理，每個節(jié)點保存集群數(shù)據(jù)的一個子集。數(shù)據(jù)的分配采用一種叫做哈希槽(hash slot)的方式來分配，和傳統(tǒng)的一致性哈希不太相同。Redis 集群有16384個哈希槽,每個key通過CRC16校驗后對16384取模來決定放置哪個槽。
為了使在部分節(jié)點失敗或者大部分節(jié)點無法通信的情況下集群仍然可用，集群使用了主從復(fù)制模型。讀取數(shù)據(jù)時，根據(jù)一致性哈希算法到對應(yīng)的 master 節(jié)點獲取數(shù)據(jù)，如果master 掛掉之后，會啟動一個對應(yīng)的 salve 節(jié)點來充當(dāng) master 。
2、環(huán)境準備
這里準備在一臺PC上搭建一個3主3從的redis集群。
在/opt/目錄下新建一個文件夾rediscluster，用來存放集群節(jié)點目錄。
然后分別新建server10、server11、server20、server21、server30、server31 6個文件夾準備6個redis節(jié)點，這些節(jié)點分別使用6379、6380、6381、6382、6383、6384端口，以server10為例配置如下：
port 6379 daemonize yes pidfile /var/run/redis_6379.pid cluster-enabled yes cluster-node-timeout 15000 cluster-config-file nodes-6379.conf
其他節(jié)點只需修改端口和文件名，依次按此進行配置即可，配置完成后啟動這些節(jié)點。
[root@localhost rediscluster]# ./server10/redis-server ./server10/redis.conf & [root@localhost rediscluster]# ./server11/redis-server ./server11/redis.conf & [root@localhost rediscluster]# ./server20/redis-server ./server20/redis.conf & [root@localhost rediscluster]# ./server21/redis-server ./server21/redis.conf & [root@localhost rediscluster]# ./server30/redis-server ./server30/redis.conf & [root@localhost rediscluster]# ./server31/redis-server ./server31/redis.conf &
查看啟動狀態(tài)：
[root@localhost rediscluster]# ps -ef|grep redis root 11842 1 0 15:03 ? 00:00:12 ./server10/redis-server 127.0.0.1:6379 [cluster] root 11950 1 0 15:03 ? 00:00:13 ./server11/redis-server 127.0.0.1:6380 [cluster] root 12074 1 0 15:04 ? 00:00:13 ./server20/redis-server 127.0.0.1:6381 [cluster] root 12181 1 0 15:04 ? 00:00:12 ./server21/redis-server 127.0.0.1:6382 [cluster] root 12297 1 0 15:04 ? 00:00:12 ./server30/redis-server 127.0.0.1:6383 [cluster] root 12404 1 0 15:04 ? 00:00:12 ./server31/redis-server 127.0.0.1:6384 [cluster]
3、集群配置
非常簡單：redis-cli --cluster create 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 --cluster -replicas 1
其中-replicas 1表示每個主節(jié)點1個從節(jié)點
[root@localhost rediscluster]# ./server10/redis-cli --cluster create 127.0.0.1:6379 127.0.0.1:6380 127.0.0.1:6381 127.0.0.1:6382 127.0.0.1:6383 127.0.0.1:6384 --cluster-replicas 1 >>> Performing hash slots allocation on 6 nodes... Master[0] -> Slots 0 - 5460 Master[1] -> Slots 5461 - 10922 Master[2] -> Slots 10923 - 16383 Adding replica 127.0.0.1:6383 to 127.0.0.1:6379 Adding replica 127.0.0.1:6384 to 127.0.0.1:6380 Adding replica 127.0.0.1:6382 to 127.0.0.1:6381 >>> Trying to optimize slaves allocation for anti-affinity [WARNING] Some slaves are in the same host as their master M: efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379 slots:[0-5460] (5461 slots) master M: 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380 slots:[5461-10922] (5462 slots) master M: d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381 slots:[10923-16383] (5461 slots) master S: 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382 replicates 63e20c75984e493892265ddd2a441c81bcdc575c S: fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383 replicates d9a79ed6204e558b2fcee78ea05218b4de006acd S: ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384 replicates efa84a74525749b8ea20585074dda81b852e9c29 Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node >>> Sending CLUSTER MEET messages to join the cluster Waiting for the cluster to join .... >>> Performing Cluster Check (using node 127.0.0.1:6379) M: efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379 slots:[0-5460] (5461 slots) master additional replica(s) M: d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381 slots:[10923-16383] (5461 slots) master additional replica(s) S: 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382 slots: (0 slots) slave replicates 63e20c75984e493892265ddd2a441c81bcdc575c S: ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384 slots: (0 slots) slave replicates efa84a74525749b8ea20585074dda81b852e9c29 M: 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380 slots:[5461-10922] (5462 slots) master additional replica(s) S: fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383 slots: (0 slots) slave replicates d9a79ed6204e558b2fcee78ea05218b4de006acd [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
創(chuàng)建完成，主從節(jié)點分配如下：
Adding replica 127.0.0.1:6383 to 127.0.0.1:6379 Adding replica 127.0.0.1:6384 to 127.0.0.1:6380 Adding replica 127.0.0.1:6382 to 127.0.0.1:6381
4、集群測試
通過6379客戶端連接后進行測試，發(fā)現(xiàn)轉(zhuǎn)向了6381：
[root@localhost rediscluster]# ./server10/redis-cli -h 127.0.0.1 -c -p 6379 127.0.0.1:6379> set foo bar -> Redirected to slot [12182] located at 127.0.0.1:6381 OK 127.0.0.1:6381> get foo "bar"
在6381上連接測試：
[root@localhost rediscluster]# ./server10/redis-cli -h 127.0.0.1 -c -p 6381 127.0.0.1:6381> get foo "bar"
結(jié)果相同，說明集群配置正常。
5、集群節(jié)點擴容
在rediscluster目錄下在新增兩個目錄server40和server41,新增2個redis節(jié)點配置6385和6386兩個端口。將6385作為新增的master節(jié)點，6386作為從節(jié)點，然后啟動節(jié)點：
[root@localhost server41]# ps -ef|grep redis root 11842 1 0 15:03 ? 00:00:18 ./server10/redis-server 127.0.0.1:6379 [cluster] root 11950 1 0 15:03 ? 00:00:19 ./server11/redis-server 127.0.0.1:6380 [cluster] root 12074 1 0 15:04 ? 00:00:18 ./server20/redis-server 127.0.0.1:6381 [cluster] root 12181 1 0 15:04 ? 00:00:18 ./server21/redis-server 127.0.0.1:6382 [cluster] root 12297 1 0 15:04 ? 00:00:17 ./server30/redis-server 127.0.0.1:6383 [cluster] root 12404 1 0 15:04 ? 00:00:18 ./server31/redis-server 127.0.0.1:6384 [cluster] root 30563 1 0 18:01 ? 00:00:00 ./redis-server 127.0.0.1:6385 [cluster] root 30582 1 0 18:02 ? 00:00:00 ./redis-server 127.0.0.1:6386 [cluster]
添加主節(jié)點：
[root@localhost server41]# ./redis-cli --cluster add-node 127.0.0.1:6385 127.0.0.1:6379 >>> Adding node 127.0.0.1:6385 to cluster 127.0.0.1:6379 >>> Performing Cluster Check (using node 127.0.0.1:6379) M: efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379 slots:[0-5460] (5461 slots) master additional replica(s) M: d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381 slots:[10923-16383] (5461 slots) master additional replica(s) S: 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382 slots: (0 slots) slave replicates 63e20c75984e493892265ddd2a441c81bcdc575c S: ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384 slots: (0 slots) slave replicates efa84a74525749b8ea20585074dda81b852e9c29 M: 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380 slots:[5461-10922] (5462 slots) master additional replica(s) S: fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383 slots: (0 slots) slave replicates d9a79ed6204e558b2fcee78ea05218b4de006acd [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 127.0.0.1:6385 to make it join the cluster. [OK] New node added correctly.
查看節(jié)點列表：
[root@localhost server41]# ./redis-cli 127.0.0.1:6379> cluster nodes 22e8a8e97d6f7cc7d627e577a986384d4d181a4f 127.0.0.1:6385@16385 master - 0 1555064037664 0 connected efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379@16379 myself,master - 0 1555064036000 1 connected 0-5460 d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381@16381 master - 0 1555064038666 3 connected 10923-16383 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382@16382 slave 63e20c75984e493892265ddd2a441c81bcdc575c 0 1555064035000 4 connected ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384@16384 slave efa84a74525749b8ea20585074dda81b852e9c29 0 1555064037000 6 connected 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380@16380 master - 0 1555064037000 2 connected 5461-10922 fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383@16383 slave d9a79ed6204e558b2fcee78ea05218b4de006acd 0 1555064037000 5 connected
添加從節(jié)點：
[root@localhost server41]# ./redis-cli --cluster add-node 127.0.0.1:6386 127.0.0.1:6379 --cluster-slave --cluster-master-id 22e8a8e97d6f7cc7d627e577a986384d4d181a4f >>> Adding node 127.0.0.1:6386 to cluster 127.0.0.1:6379 >>> Performing Cluster Check (using node 127.0.0.1:6379) M: efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379 slots:[0-5460] (5461 slots) master additional replica(s) M: 22e8a8e97d6f7cc7d627e577a986384d4d181a4f 127.0.0.1:6385 slots: (0 slots) master M: d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381 slots:[10923-16383] (5461 slots) master additional replica(s) S: 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382 slots: (0 slots) slave replicates 63e20c75984e493892265ddd2a441c81bcdc575c S: ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384 slots: (0 slots) slave replicates efa84a74525749b8ea20585074dda81b852e9c29 M: 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380 slots:[5461-10922] (5462 slots) master additional replica(s) S: fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383 slots: (0 slots) slave replicates d9a79ed6204e558b2fcee78ea05218b4de006acd [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. >>> Send CLUSTER MEET to node 127.0.0.1:6386 to make it join the cluster. Waiting for the cluster to join >>> Configure node as replica of 127.0.0.1:6385. [OK] New node added correctly.
添加成功后，為新節(jié)點分配數(shù)據(jù)：
[root@localhost server41]# ./redis-cli --cluster reshard 127.0.0.1:6385 How many slots do you want to move (from 1 to 16384)? 1000 What is the receiving node ID? 22e8a8e97d6f7cc7d627e577a986384d4d181a4f Please enter all the source node IDs. Type 'all' to use all the nodes as source nodes for the hash slots. Type 'done' once you entered all the source nodes IDs. Source node #1: all
這樣就新增完畢了，可以通過cluster nodes命令查看一下新增后的slot分布
127.0.0.1:6379> cluster nodes 22e8a8e97d6f7cc7d627e577a986384d4d181a4f 127.0.0.1:6385@16385 master - 0 1555064706000 7 connected 0-332 5461-5794 10923-11255 efa84a74525749b8ea20585074dda81b852e9c29 127.0.0.1:6379@16379 myself,master - 0 1555064707000 1 connected 333-5460 d9a79ed6204e558b2fcee78ea05218b4de006acd 127.0.0.1:6381@16381 master - 0 1555064705000 3 connected 11256-16383 7c24e205301b38caa1ff3cd8b270a1ceb7249a2e 127.0.0.1:6386@16386 slave 22e8a8e97d6f7cc7d627e577a986384d4d181a4f 0 1555064705000 7 connected 0469ec03b43e27dc2b7b4eb24de34e10969e3adf 127.0.0.1:6382@16382 slave 63e20c75984e493892265ddd2a441c81bcdc575c 0 1555064707000 4 connected ddebc3ca467d15c7d25125e4e16bcc5576a13699 127.0.0.1:6384@16384 slave efa84a74525749b8ea20585074dda81b852e9c29 0 1555064707236 6 connected 63e20c75984e493892265ddd2a441c81bcdc575c 127.0.0.1:6380@16380 master - 0 1555064706000 2 connected 5795-10922 fd8ea61503e7c9b6e950894c0da41aed3ee19e7e 127.0.0.1:6383@16383 slave d9a79ed6204e558b2fcee78ea05218b4de006acd 0 1555064708238 5 connected
6、集群節(jié)點縮減
縮減節(jié)點時先縮減從節(jié)點:
[root@localhost server41]# ./redis-cli --cluster del-node 127.0.0.1:6386 7c24e205301b38caa1ff3cd8b270a1ceb7249a2e >>> Removing node 7c24e205301b38caa1ff3cd8b270a1ceb7249a2e from cluster 127.0.0.1:6386 >>> Sending CLUSTER FORGET messages to the cluster... >>> SHUTDOWN the node.
然后進行主節(jié)點slot轉(zhuǎn)移：
[root@localhost server41]# ./redis-cli --cluster reshard 127.0.0.1:6385How many slots do you want to move (from 1 to 16384)? 1000What is the receiving node ID? efa84a74525749b8ea20585074dda81b852e9c29 //要移到的節(jié)點Please enter all the source node IDs. Type 'all' to use all the nodes as source nodes for the hash slots. Type 'done' once you entered all the source nodes IDs. Source node #1: 22e8a8e97d6f7cc7d627e577a986384d4d181a4f //要刪除的主節(jié)點Source node #2: done
最后在縮減主節(jié)點
[root@localhost server41]# ./redis-cli --cluster reshard 127.0.0.1:6385 How many slots do you want to move (from 1 to 16384)? 1000 What is the receiving node ID? efa84a74525749b8ea20585074dda81b852e9c29 //要移到的節(jié)點 Please enter all the source node IDs. Type 'all' to use all the nodes as source nodes for the hash slots. Type 'done' once you entered all the source nodes IDs. Source node #1: 22e8a8e97d6f7cc7d627e577a986384d4d181a4f //要刪除的主節(jié)點 Source node #2: done
以上就是什么是redis集群配置與管理，小編相信有部分知識點可能是我們?nèi)粘９ぷ鲿姷交蛴玫降?。希望你能通過這篇文章學(xué)到更多知識。更多詳情敬請關(guān)注億速云行業(yè)資訊頻道。
免責(zé)聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點不代表本網(wǎng)站立場，如果涉及侵權(quán)請聯(lián)系站長郵箱：is@yisu.com進行舉報，并提供相關(guān)證據(jù)，一經(jīng)查實，將立刻刪除涉嫌侵權(quán)內(nèi)容。
億速云公眾號
手機網(wǎng)站二維碼
